Name the reactants and products in the following skeletal equation and balance them.
(iii) $N a + O_{2} \to N a_{2} O$

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Solution

The skeletal equation is:
$N a + O_{2} \to N a_{2} O$
Reactants are sodium and oxygen, the product is sodium oxide

Count the number of atoms of each element.

To equalize $O$ , multiply $N a_{2} O$ by $2$

$N a + O_{2} \to 2 N a_{2} O$

To equalize $N a$ , multiply $N a$ by $4$ .

$4 N a + O_{2} \to 2 N a_{2} O$
Hence, the equation is balanced.

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